/**************************************************************************
 *
 * Copyright (C) 2005 Steve Karg <skarg@users.sourceforge.net>
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
 * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 *********************************************************************/
#include <stddef.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include "bacnet/config.h"
#include "bacnet/bacdef.h"
#include "bacnet/bacdcode.h"
#include "bacnet/bacerror.h"
#include "bacnet/bacdevobjpropref.h"
#include "bacnet/apdu.h"
#include "bacnet/npdu.h"
#include "bacnet/abort.h"
#include "bacnet/reject.h"
#include "bacnet/rp.h"
/* basic objects, services, TSM, and datalink */
#include "bacnet/basic/object/device.h"
#include "bacnet/basic/tsm/tsm.h"
#include "bacnet/basic/services.h"
#include "bacnet/datalink/datalink.h"

/** @file h_rp.c  Handles Read Property requests. */

/** Handler for a ReadProperty Service request.
 * @ingroup DSRP
 * This handler will be invoked by apdu_handler() if it has been enabled
 * by a call to apdu_set_confirmed_handler().
 * This handler builds a response packet, which is
 * - an Abort if
 *   - the message is segmented
 *   - if decoding fails
 *   - if the response would be too large
 * - the result from Device_Read_Property(), if it succeeds
 * - an Error if Device_Read_Property() fails
 *   or there isn't enough room in the APDU to fit the data.
 *
 * @param service_request [in] The contents of the service request.
 * @param service_len [in] The length of the service_request.
 * @param src [in] BACNET_ADDRESS of the source of the message
 * @param service_data [in] The BACNET_CONFIRMED_SERVICE_DATA information
 *                          decoded from the APDU header of this message.
 */
void handler_read_property(uint8_t *service_request,
    uint16_t service_len,
    BACNET_ADDRESS *src,
    BACNET_CONFIRMED_SERVICE_DATA *service_data)
{
    BACNET_READ_PROPERTY_DATA rpdata;
    int len = 0;
    int pdu_len = 0;
    int apdu_len = -1;
    int npdu_len = -1;
    BACNET_NPDU_DATA npdu_data;
    bool error = true; /* assume that there is an error */
    int bytes_sent = 0;
    BACNET_ADDRESS my_address;

    /* configure default error code as an abort since it is common */
    rpdata.error_code = ERROR_CODE_ABORT_SEGMENTATION_NOT_SUPPORTED;
    /* encode the NPDU portion of the packet */
    datalink_get_my_address(&my_address);
    npdu_encode_npdu_data(&npdu_data, false, MESSAGE_PRIORITY_NORMAL);
    npdu_len = npdu_encode_pdu(
        &Handler_Transmit_Buffer[0], src, &my_address, &npdu_data);
    if (npdu_len <= 0) {
        /* If 0 or negative, there were problems with the data or encoding. */
        len = BACNET_STATUS_ABORT;
    #if PRINT_ENABLED
            fprintf(stderr, "RP: npdu_encode_pdu error.  Sending Abort!\n");
    #endif
    } else if (service_data->segmented_message) {
        /* we don't support segmentation - send an abort */
        len = BACNET_STATUS_ABORT;
#if PRINT_ENABLED
        fprintf(stderr, "RP: Segmented message.  Sending Abort!\n");
#endif
    } else {
        len = rp_decode_service_request(service_request, service_len, &rpdata);
    #if PRINT_ENABLED
        if (len <= 0) {
            fprintf(stderr, "RP: Unable to decode Request!\n");
        }
    #endif
        if (len < 0) {
            /* bad decoding - skip to error/reject/abort handling */
            error = true;
    #if PRINT_ENABLED
            fprintf(stderr, "RP: Bad Encoding.\n");
    #endif
        } else {
            /* Test for case of indefinite Device object instance */
            if ((rpdata.object_type == OBJECT_DEVICE) &&
                (rpdata.object_instance == BACNET_MAX_INSTANCE)) {
                rpdata.object_instance = Device_Object_Instance_Number();
            }

            apdu_len = rp_ack_encode_apdu_init(
                &Handler_Transmit_Buffer[npdu_len], service_data->invoke_id, &rpdata);
            /* configure our storage */
            rpdata.application_data = &Handler_Transmit_Buffer[npdu_len + apdu_len];
            rpdata.application_data_len =
                sizeof(Handler_Transmit_Buffer) - (npdu_len + apdu_len);
            len = Device_Read_Property(&rpdata);
            if (len >= 0) {
                apdu_len += len;
                len = rp_ack_encode_apdu_object_property_end(
                    &Handler_Transmit_Buffer[npdu_len + apdu_len]);
                apdu_len += len;
                if (apdu_len > service_data->max_resp) {
                    /* too big for the sender - send an abort
                     * Setting of error code needed here as read property processing may
                     * have overriden the default set at start */
                    rpdata.error_code = ERROR_CODE_ABORT_SEGMENTATION_NOT_SUPPORTED;
                    len = BACNET_STATUS_ABORT;
        #if PRINT_ENABLED
                    fprintf(stderr, "RP: Message too large.\n");
        #endif
                } else {
        #if PRINT_ENABLED
                    fprintf(stderr, "RP: Sending Ack!\n");
        #endif
                    error = false;
                }
            } else {
        #if PRINT_ENABLED
                fprintf(stderr, "RP: Device_Read_Property: ");
                if (len == BACNET_STATUS_ABORT) {
                    fprintf(stderr, "Abort!\n");
                } else if (len == BACNET_STATUS_ERROR) {
                    fprintf(stderr, "Error!\n");
                } else if (len == BACNET_STATUS_REJECT) {
                    fprintf(stderr, "Reject!\n");
                } else {
                    fprintf(stderr, "Unknown Len=%d\n", len);
                }
        #endif
            }
        }
    }

    if (error) {
        if (len == BACNET_STATUS_ABORT) {
            apdu_len = abort_encode_apdu(&Handler_Transmit_Buffer[npdu_len],
                service_data->invoke_id,
                abort_convert_error_code(rpdata.error_code), true);
#if PRINT_ENABLED
            fprintf(stderr, "RP: Sending Abort!\n");
#endif
        } else if (len == BACNET_STATUS_ERROR) {
            apdu_len = bacerror_encode_apdu(&Handler_Transmit_Buffer[npdu_len],
                service_data->invoke_id, SERVICE_CONFIRMED_READ_PROPERTY,
                rpdata.error_class, rpdata.error_code);
#if PRINT_ENABLED
            fprintf(stderr, "RP: Sending Error!\n");
#endif
        } else if (len == BACNET_STATUS_REJECT) {
            apdu_len = reject_encode_apdu(&Handler_Transmit_Buffer[npdu_len],
                service_data->invoke_id,
                reject_convert_error_code(rpdata.error_code));
#if PRINT_ENABLED
            fprintf(stderr, "RP: Sending Reject!\n");
#endif
        }
    }

    pdu_len = npdu_len + apdu_len;
    bytes_sent = datalink_send_pdu(
        src, &npdu_data, &Handler_Transmit_Buffer[0], pdu_len);
    if (bytes_sent <= 0) {
#if PRINT_ENABLED
        fprintf(stderr, "Failed to send PDU (%s)!\n", strerror(errno));
#endif
    }

    return;
}
